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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd3ef994e2e2eeac20307431330cf82536481a68d6023ff7b2dc074b06443dccc' 
  AND token = 'w1aJ4vQG1uYNkKfS8BPNi3Wnz9VfpxdkbwMrbY/7iak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}